(19)

(11)

EP 3 942 539 A1

(12)

(43) Date of publication: 26.01.2022 Bulletin 2022/04 (21) Application number: 20711882.9 (22) Date of filing: 13.03.2020

(51) International Patent Classification (IPC):  G08B 17/12(2006.01) G08B 29/04(2006.01) G08B 29/18(2006.01) (52) Cooperative Patent Classification (CPC): G08B 29/18; G08B 29/046; G08B 17/12; G08B 17/125 (86) International application number: PCT/EP2020/056932 (87) International publication number: WO 2020/187775 (24.09.2020 Gazette 2020/39)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 20.03.2019 SE 1950346 (71) Applicant: Firefly AB 120 30 Stockholm (SE)	(72) Inventor: JANSSON, Lennart 139 36 VÄRMDÖ (SE) (74) Representative: Keijser Bergöö, Malin Katarina  Rouse AB Docketing, PO Box 42 683 21 Hagfors 683 21 Hagfors (SE)